Predictive Control of Three Phase AC/DC Converters

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86 CHAPTER 5. INVESTIGATIONS OF CONTROL METHODS PERFORMANCE Line voltage CSF-P-DPC VF-CSF-P-DPC distortion T HD u F sw 5 kHz F sw 5 kHz 5% (Fig. 5.11) 4.4 1.7 4.5% (Fig. 5.12) 5.7 1.6 17.4% (Fig. 5.13) 17.6 5.5 10.6% (Fig. 5.14) 7.1 3.6 Table 5.1: Summarized line current T HD i factors 5.4.2 Influence of Line Voltage Sags Connections and disconnections of large loads, and short circuits in the system can cause line voltage sags (sudden drop of line voltage value). In this subsection, operation of CSF-P-DPC and VF approach under single and two phase voltage sags will be investigated. u La u Lb u Lc CSF-P-DPC (a) VF-CSF-P-DPC i La (b) u La U DC i La P ref Figure 5.15: Operation under single phase voltage sag: (a) line voltages u La , u Lb , u Lc (100 V/div), line current i La (10 A/div), (b) line voltage u La (200 V/div), U DC voltage (100 V/div), line current i La (10 A/div), referenced active power P ref (1 kW/div) Figure 5.15 shows operation under single phase sag. As it can be seen, line
5.4. LINE VOLTAGE DISTURBANCES 87 CSF-P-DPC (a) VF-CSF-P-DPC u La u Lb u Lc i La (b) u La U DC i La P ref Figure 5.16: Operation under two phase voltage sag: (a) line voltages u La , u Lb , u Lc (100 V/div), line current i La (10 A/div), (b) line voltage u La (200 V/div), U DC voltage (100 V/div), line current i La (10 A/div), referenced active power P ref (1 kW/div) 25 (a) 25 (b) 20 THD ILa THD ILb THD ILc 20 CSF-P-DPC THD ILa THD ILb THD ILc THD [%] 15 10 CSF-P-DPC THD [%] 15 10 5 VF-CSF-P-DPC 5 VF-CSF-P-DPC 0 50 60 70 80 90 100 U [%] L 0 50 60 70 80 90 100 U [%] L Figure 5.17: Current T HD factor in presence of: (a) single phase voltage sag, (b) two phase voltage sag voltage sag u La , causes DC-link voltage drop U DC . Next, DC-link voltage controller, trying to keep constant U DC , assigns higher value of active power P ref
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WARSAW UNIVERSITY OF TECHNOLOGY Fac
Page 5 and 6:
Contents Contents i 1 Introduction
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CONTENTS iii List of Symbols and Ab
Page 11 and 12:
Chapter 1 Introduction AC/DC Voltag
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Based Trajectory Based Deadbeat Con
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5 which properties are deteriorated
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Chapter 2 Voltage Source Converter
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(Sa=1, Sc=0) UP2 (Sa=1, UP1 Sb=1, S
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IL UL jωLIL UL jωLIL 2.2. MATHEMA
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ILα 1 sL+RSα - ULα 32IDC 1 sCUDC
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2.3. SUMMARY 15 2.3 Summary In this
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Iqref Idref ILq ILd ILq φ uLab UDC
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UDC Filter 20 CHAPTER 3. CONTROL ST
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Qref dP dQ uLab UDC Sabc 22 CHAPTER
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24 CHAPTER 3. CONTROL STRATEGIES FO
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Qref Pref uLab UDC Sabc 26 CHAPTER
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UDC Filter 28 CHAPTER 3. CONTROL ST
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ILq φ ωL 30 CHAPTER 3. CONTROL ST
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Lα 32 CHAPTER 3. CONTROL STRATEGIE
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34 CHAPTER 3. CONTROL STRATEGIES FO
Page 46 and 47: 36 CHAPTER 3. CONTROL STRATEGIES FO
Page 48 and 49: 38 CHAPTER 3. CONTROL STRATEGIES FO
Page 51 and 52: Chapter 4 Predictive Direct Power C
Page 53 and 54: 4.3. VARIABLE SWITCHING FREQUENCY P
Page 55 and 56: UPdqUDC Qref UDCSabc uLab iLab 4.3.
Page 57 and 58: UPdqUDC UDCSabc uLab iLab 4.4. CURR
Page 59 and 60: UPdqUDC Qref Pref UDCSabc uLab iLab
Page 61 and 62: 4.6. CONSTANT SWITCHING FREQUENCY P
Page 63 and 64: PP1 fq1 fq2 PP4 PP5 PP6 PP3 fp3 fp3
Page 65 and 66: Sb Sc Sa Sb Sa Sc Sb Sa 4.6. CONSTA
Page 67 and 68: fqi fpi Qref Sabc 4.6. CONSTANT SWI
Page 69 and 70: 4.7. VF BASED CSF - PREDICTIVE DIRE
Page 71 and 72: Qref fpi Sabc iLab 4.7. VF BASED CS
Page 73 and 74: 4.8. SIMULATION RESULTS 63 200 150
Page 77 and 78: 4.8. SIMULATION RESULTS 67 Mag (% o
Page 85 and 86: 4.9. SUMMARY 75 Control Method t se
Page 87 and 88: Chapter 5 Investigations of Control
Page 89 and 90: 5.1. ROBUSTNESS TO PARAMETERS MISMA
Page 91 and 92: Sabc UDC UPαβ UPαβ Lest Lest UP
Page 93 and 94: 5.4. LINE VOLTAGE DISTURBANCES 83 (
Page 95: 5.4. LINE VOLTAGE DISTURBANCES 85 (
Page 99 and 100: Chapter 6 Experimental Study Experi
Page 101 and 102: 6.1. STEADY STATE OPERATION 91 (a)
Page 103 and 104: 6.1. STEADY STATE OPERATION 93 Cont
Page 105 and 106: 6.2. TRANSIENT OPERATION 95 (a) ST-
Page 111 and 112: 6.3. OPERATION WITH LOW SWITCHING F
Page 117: 6.4. SUMMARY 107 Control Method t s
Page 120 and 121: 110 CHAPTER 7. SUMMARY AND FINAL CO
Page 122 and 123: 112 BIBLIOGRAPHY [11] K. Hyosung an
Page 124 and 125: 114 BIBLIOGRAPHY [38] A. Nasiri,
Page 126 and 127: 116 BIBLIOGRAPHY [66] F. Morel, J.
Page 128 and 129: 118 BIBLIOGRAPHY 13. A. Lopez de He
Page 131 and 132: Appendix A Coordinate transformatio
Page 133 and 134: q β A.2. ROTATING SYSTEM 123 A.2 R
Page 135 and 136: Appendix B Predictive Current Contr
Page 137 and 138: ∆ILαβP6 ∆ILαβP5 Figure B.2:
Page 139: Figure B.4: Vector diagram of predi
Page 142 and 143: 132 APPENDIX C. PREDICTIVE DIRECT P
Page 145 and 146: List of Symbols and Abbreviations S
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137 Symbols Description Definition
Page 149 and 150:
List of Figures 1.1 Conjunction bet
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LIST OF FIGURES 141 5.3 Line curren
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LIST OF TABLES 143 B.2 An example o
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Predictive Control of Three Phase AC/DC Converters

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